Ch.3 - Mass Relationships in Chemical Reactions
Chapter 3, Problem 10
Silver sulfide, the tarnish on silverware, comes from the reaction of silver metal with hydrogen sulfide (H2S).The unbalanced equation is: Ag + H2S + O2 --> Ag2S + H2O Unbalanced If the reaction was used intentionally to prepare Ag2S, how many grams would be formed from 496 g of Ag, 80.0 g of H2S, and excess O2 if the reaction takes place in 90% yield? (LO 3.9) (a) 525 g (b) 1139 g (c) 583 g (d) 1025
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Related Practice
Textbook Question
If 42.85 grams of salicylic acid reacts with excess acetic anhydride and produces 48.47 grams of aspirin, what is the percent yield of the reaction? (LO 3.6)
(a) 88.40%
(b) 64.69%
(c) 86.72%
(d) 78.74%
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Textbook Question
The diagram represents a mixture of AB2 and B2 before it reacts to form AB3. (Red spheres = A, blue spheres = B.) Which reactant is limiting, and how many AB3 molecules are formed? (LO 3.7)
(a) B2 is limiting, and 10 molecules of AB3 are formed.
(b) B2 is limiting, and 4 molecules of AB3 are formed.
(c) AB2 is limiting, and 6 molecules of AB3 are formed.
(d) AB2 is limiting, and 4 molecules of AB3 are formed
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Textbook Question
If 2.00 moles of nitrogen and 5.50 moles of hydrogen are placed in a reaction vessel and react to form ammonia, what is the theoretical yield of ammonia (NH3)? (LO 3.8)
N2(g) + 3 H2(g) --> 2 NH3(g)
(a) 31.2 g
(b) 62.3 g
(c) 93.7 g
(d) 34.1
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Textbook Question
What is the percent composition by mass of Mn in potas-sium permanganate, KMnO4? (LO 3.10)
(a) 22.6%
(b) 34.8%
(c) 49.9%
(d) 54.9%
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Textbook Question
Dimethylhydrazine, a colorless liquid used as a rocket fuel, is 40.0% C, 13.3% H, and 46.7% N. What is the empirical formula? (LO 3.11) (a) CH4N9 (b) CH2N (c) C2H4N (d) C2H5N2
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Textbook Question
Lactic acid forms in muscle tissue after strenuous exercise. Elemental analysis shows that lactic acid is 40.0% carbon, 6.71% hydrogen, and 53.3% oxygen by mass. If the molec-ular weight of lactic acid is 90.08, what is the molecular for-mula? (LO 3.11)
(a) CH2O
(b) C3H6O3
(c) C4H8O4
(d) C4H10O2
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